A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

What is the next number in this matchsticks series riddle?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Prove that twice of ten is the same as twice of eleven.

What is more useful when it is broken?

Can you count the number of triangles in the given picture?

Replace the question mark with the correct number in below Picture:

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?